JP2016525705A - 光拡散フィルム、その製造方法及びそれを採用した液晶ディスプレイ用バックライトユニット - Google Patents
光拡散フィルム、その製造方法及びそれを採用した液晶ディスプレイ用バックライトユニット Download PDFInfo
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- JP2016525705A JP2016525705A JP2016525266A JP2016525266A JP2016525705A JP 2016525705 A JP2016525705 A JP 2016525705A JP 2016525266 A JP2016525266 A JP 2016525266A JP 2016525266 A JP2016525266 A JP 2016525266A JP 2016525705 A JP2016525705 A JP 2016525705A
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- fiber
- light
- matrix
- polymer resin
- diffusion film
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-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
Abstract
Description
繊維層の有機繊維成分としてのポリエチレンナフタレート(PEN)を溶融し、加圧状態で3,800個の孔を有する紡糸ノズルを介して1km/minの速度にて紡糸を行って有機繊維を製造した。前記製造された3,800個の有機繊維及びマトリックスの透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を1:9重量比で混合し、同時に投入して押出した。このとき、透明高分子樹脂成分であるポリ−4−メチレンペンテン(PMP)の溶融温度は232℃であり、有機繊維成分であるポリエチレンナフタレート(PEN)の溶融温度は280℃であり、両成分間の溶融温度差は48℃であった。
前記実施例1において製造された有機繊維及び透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を4:6の重量比で混合して同時に押出した以外は、前記実施例1の方法と同様にして光拡散フィルムを製造した。
前記実施例1において製造された有機繊維及び透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を5:5の重量比で混合して同時に押出した以外は、前記実施例1の方法と同様にして光拡散フィルムを製造した。
繊維層の有機繊維成分としてポリシクロヘキシレンジメチレンテレフタレート(Polycyclohexane Dimethylterephthalate:PCT)(イーストマン社製のTritan TX2001)成分を用い、マトリックスの透明高分子樹脂としてポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)成分を用い、これらを3:7の重量比で混合した以外は、前記実施例1の方法と同様にして光拡散フィルムを製造した。
前記実施例4において製造された有機繊維としてのポリ1,4−シクロヘキサンジメチレンテレフタレート(PCT)(イーストマン社製のTritan TX2001)及び透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を5:5の重量比で混合して同時に押出した以外は、前記実施例4の方法と同様にして光拡散フィルムを製造した。
前記実施例1において、透明高分子樹脂であるポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)からなるマトリックス内に複屈折性有機繊維が一方向に平行に配置された繊維層が配列された単一層構造の光拡散フィルムを製造した。
前記実施例1において製造された有機繊維及び透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を8:2の重量比で混合して同時に押出した以外は、前記実施例1の方法と同様にして光拡散フィルムを製造した。
前記実施例4において製造された有機繊維としてのポリ1,4−シクロヘキサンジメチレンテレフタレート(PCT)(イーストマン社製のTritan TX2001)及び透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を1:9の重量比で混合して同時に押出した以外は、前記実施例4の方法と同様にして光拡散フィルムを製造した。
前記実施例4において製造された有機繊維としてのポリ1,4−シクロヘキサンジメチレンテレフタレート(PCT)(イーストマン社製のTritan TX2001)及び透明高分子樹脂としてのポリ−4−メチレンペンテン(PMP)(三井ケミカル社製のTPX(登録商標) RT 18)を9:1の重量比で混合して同時に押出した以外は、前記実施例4の方法と同様にして光拡散フィルムを製造した。
前記実施例1において製造された光拡散フィルムの透過度を、交差偏光子との間隔が45°または0°であるときに測定した。
前記実験例1において行われた透過度の実験に用いられた繊維層を走査電子顕微鏡を用いて測定した結果を図5に示す。その結果、マイクロ寸法よりも小さい寸法の有機繊維が確認された。
前記実施例1において製造された光拡散フィルムの散乱パターンを測定するために、バックライトユニットの導光板(LGP)の上に前記光拡散フィルムを載せてパターンを観察した。
前記実施例1において製造された光拡散フィルムの使用有無による光分布度を確認するために、水平(0°)、斜め(45°)及び垂直(90°)によりELDIM社製のEZコントラストXL88を用いて光分布を測定した。
11…有機繊維
20…マトリックス
1…光拡散フィルム
Claims (15)
- マトリックス内に、
一方向に平行に配置された繊維層の少なくとも2層以上が0°、90°または±θの角度のうち少なくとも2以上の組み合わせで多軸に交互に配列された光拡散フィルム。 - 前記マトリックスが、等方性または異方性高分子樹脂からなることを特徴とする請求項1に記載の光拡散フィルム。
- 前記繊維層が一方向に配列されるとき、周りの繊維間一定な間隔に保たれることを特徴とする請求項1に記載の光拡散フィルム。
- 前記繊維層が複屈折性有機繊維であることを特徴とする請求項1に記載の光拡散フィルム。
- 前記複屈折性有機繊維の屈折率が、マトリックスを構成する透明高分子樹脂の屈折率に比べて0.05以上高く設計されることを特徴とする請求項4に記載の光拡散フィルム。
- 前記屈折率であるとき、透光率が40%以上であることを特徴とする請求項5に記載の光拡散フィルム。
- 前記有機繊維の断面が、円形、三角形または四角形のうちから選ばれるいずれか一つの断面形状またはこれらの組み合わせの異形断面形状を有することを特徴とする請求項4に記載の光拡散フィルム。
- 前記複屈折性有機繊維及び透明高分子樹脂成分が3:7〜7:3の重量比で含有されることを特徴とする請求項4に記載の光拡散フィルム。
- 前記複屈折性有機繊維が、ポリエチレンナフタレート(PEN)、ポリシクロヘキサンジメチルテレフタレート(PCT)、コーポリエチレンナフタレート(co−PEN)、ポリエチレンテレフタレート(PET)、ポリカーボネート(PC)、ポリカーボネート(PC)アロイ、ポリスチレン(PS)、耐熱ポリスチレン(PS)、ポリメチルメタクリレート(PMMA)、ポリブチレンテレフタレート(PBT)、ポリプロピレン(PP)、ポリエチレン(PE)、アクリロニトリルブタジエンスチレン(ABS)、ポリウレタン(PU)、ポリイミド(PI)、ポリ塩化ビニー(PVC)、スチレンアクリロニトリル混合(SAN)、エチレン酢酸ビニール(EVA)、ポリアミド(PA)、ポリアセタール(POM)、フェノール、エポキシ(EP)、尿素(UF)、メラミン(MF)、不飽和ポリエステル(UP)、シリコン(SI)、エラストマー及びシクロオレフィンポリマーよりなる群から選ばれる1種以上であることを特徴とする請求項4に記載の光拡散フィルム。
- 前記複屈折性有機繊維がポリシクロヘキサンジメチルテレフタレート(PCT)であり、透明高分子樹脂がポリ−4−メチレンペンテン(PMP)であるとき、前記複屈折性有機繊維が3:7〜5:5の重量比で含有されることを特徴とする請求項8に記載の光拡散フィルム。
- 1)複屈折性有機繊維成分からなるナノ長繊維及び透明高分子樹脂成分を異成分複合ノズルに同時に投入して、透明高分子樹脂からなるマトリックス内においてインサイチュ方式によりナノ長繊維が一方向に配置されるように繊維層を形成するが、前記繊維層は各層間の配置方向に対して90°または±θの角度の少なくとも2以上の組み合わせで多軸に交互に配列され、
2)前記工程後に、延伸工程及び冷却工程が行われる光拡散フィルムの製造方法。 - 1)複屈折性有機繊維成分からなるナノ長繊維及び透明高分子樹脂成分を異成分複合ノズルに同時に投入して、透明高分子樹脂からなるマトリックス内においてインサイチュ方式によりナノ長繊維が一方向に配置されるように繊維層を形成し、
2)前記繊維層の配置方向に対して90°または±θの角度の少なくとも2以上の組み合わせで2層以上に繊維層を交互に配列し、
3)前記交互に配列された繊維層を複合化させる光拡散フィルムの製造方法。 - 前記複屈折性有機繊維成分及び透明高分子樹脂成分が3:7〜7:3の重量比で同時に押出されることを特徴とする請求項11または請求項12に記載の光拡散フィルムの製造方法。
- 前記複合化が、ダブルベルトプレス方式、ラミネーション方式及びキャレンダー方式よりなる群から選ばれるいずれか一つにより行われることを特徴とする請求項12に記載の前記光拡散フィルムの製造方法。
- 請求項1から請求項10のうちのいずれか一項に記載の光拡散フィルムを採用した液晶ディスプレイ用バックライトユニット。
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JP6981984B2 (ja) * | 2016-09-14 | 2021-12-17 | 株式会社巴川製紙所 | 反射型表示装置用光拡散フィルム積層体及びこれを用いた反射型表示装置 |
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